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How to aerate a waterlogged lawn

 Aeration Forks and how to use them.
 
Aeration tools are simply forks that have  hollow metal tines you push into soil and then pull out, removing a core of grass, roots and soil, forming and leaving a small hole in the lawn. Aerating allows air to get into the soil and rain water to drain from the surface into the earth below, instead of puddling.
 
Aerate a lawn manually .
With the aerating fork, start along one edge of your lawn, step on the aeration fork to insert the tines and then pull it out.  Take a 6 inch step back and repeat,  until you have aerated the complete lawn.   Each time you step down, it should push out the previous soil core. Another way is to use spiked aeration boots.
 
On soggy grass and wet clay, If the tynes clog up and nothing comes out, use a screwdriver to poke out the aeration tube. When finished, your lawn will have little plugs of earth  scattered all over it.  
Best to  leave them to break down  or if you are a fussy gardener use the back of a metal rake to break them up.
 
Aerating a waterlogged lawn that puddles with surface water, before aerating, spread grit/sharp sand listed below over the lawn, leaving the tips of the grass showing. The sand will fill the holes as you fork it over helping to keep the holes open, allowing water and air to reach the roots.
Hard work, but you will end up with a healthier lawn.
Heavy Duty Hollow Tine Aerator
  • Heavy Duty Aerator for compacted soils and lawns
  • Removes cores for longer lasting aeration particularly on clay soils
  • Use anytime for all over lawn aeration
  • Aerating helps revive dry patches or hard areas
  • Helps reduce moss in damp areas by improving drainage
  • Aerating with this heavy duty aerator after installing french drains helps the system work to full capacity.
  • Easily the simplest tool to use I have found.

 

Heavy Duty Hand Held Push Along Aerator- c/w Spikes. 

  • Easy-rolling lawn aerator lets air, water and nutrients reach grass roots.

How to aerate and apply sand to a waterlogged lawn

 

This Is the Grit sand to use, do not use builders sand it will clog up the soil.
 
As soon as possible after the drainage has been installed spread this grit sand over the whole area to be turfed, including the French drain trenches and aerate the surface, this ensures the drains work to full capacity by draining surface water into the soil and drainage channels. 
When spreading the  grit sand over the lawn make sure you leave the tips of the grass showing.
Aerating the whole area using grit sand, including over the trenches, ensures surface water drains from the surface into the soil and drainage system.